Only about 11 hours of uptime and memory has dropped to about 75. Don't seem to have slowed down yet but it has never done this before. I'm not using Maker and I haven't made any major changes in weeks.
Thoughts on what I should be looking for?
If you are at 75K you really need to consider rebooting before it locks up - lowest I’ve seen operational has been around 80. As to what causes leakage, backups (particularly the full cloud - but you usually recover most of it), HTTP calls have been regular suspects (haven’t checked recently though to see if still the case), sometimes driver or app upgrades (particularly drivers with a lot of instances), faulty code (particularly in libraries) seems to get me regularly in development, run away processes (look for high event count or CPU), etc.
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Interesting. I just checked again and it went back up to 264. Now that I think of it I did update a drivers code. It was the Samsung TV remote by @djgutheinz
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Good news on the recovery. Code updates cause a recompile of the code into machine usable format, and it feels like it forces each driver instance to do a reload of the code into memory which would cause an allocation of more memory before it can release the memory used by the old code.
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Looks like it's holding at 264. I checked logs and don't even see the updated device. Nothing stands out for abnormally high number of events. Highest is actually 277 from Hub Information.
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I did see a rare spike in temperature and CPU usage that continued to come and go on my Lighting C-7 hub over the last few days.... Not sure if it's related.... Re-Initializing my custom devices connecting to my Hue hub may have fixed the issue....
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That's wild. Also, all the troubles seem to have stopped after I updated.
I've solved all my hub memory issues by simply not looking. 
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Oh absolutely! I have released much self inflicted stress by removing several monitors and associated automations.
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